I've been trying a network install of 7.1.1 both as a Virtualbox guest (under Ubuntu) and onto my hard drive without success, despite multiple attempts.
Typically anywhere between 4% and 80% completion X freezes or crashes randomly and causes a hard reset.
I've tried booting without ACPI and in VESA mode but it doesn't seem to make any difference.
My mobo is an ASUS P5K-WS and I am using an Nvidia 8800GT graphics card.
I also tried 7.1. Same problem.